Reproducing apparatus



REPRODUCING APPARATUS Filed Jan e, 1925 TLS-Lin f" Patented July 27, 1926n Ni sa THEODORE WILLARD CASE, OE AUBURN, NEW YORK, ASSIGNOR TO CASE :RESEARCHv LABORATORY INCORPORATED, OF AUB YORK. i

URN, NEW YORK, A CORPORATION or NEW REPRODUCING APPARATUS.

Application filed January `This invention relatesto a certain new and useful reproducing apparatus. More specifically as at present adapted, the reproduc;

ing apparatus is of a.V character utilizing a sound record such as the ordinary phonograph record.

The primary object of the invention is to effect a clear and distinct reproduction of sound waves that have been translated into a physical record. such'as a phonograph record, such reproductionunaccompanied by the usual scratching or metallic sounds which are produced in the use of the present apparatus Where a needle is pressed into a groove formed in the record and rides there-A in with very intimate contact.

Other Objects and advantages relate to the details of the apparatus, all as will more fully appear from the .following description taken in connection with the accompanying drawings, in which:

Figure 1 is a diagrammatic illustration ot' ,an apparatus of my invention. Y

The apparatus as shown comprises a bulb y or evacuated vessel -1- containing a filament 2, a grid -3- and a plate -4-. These particular disclosures are illustrations `Oia heated electrode and two unheated elec-k trodes. The filament may be heated in any suitable manner, as by means of a heating circuit containing a source of potential -5- and a rheostat -6-. The filament is connected in circuit with the plate, such circuit containing a source'of potential -7- and a translating device such as telephone receivers -8-, which may, if desired be equipped with suitable amplifying devices as tapered horns and the like. The grid -3- is connected to a Wire or conductor -9 that terminates in a needle -10-.

It is-found that when this needle is held lightly in the sound record groove of the phonograph record -11-- without any intimatel or accurate Contact with' the said groove, that for some present. unknown reason, a clear and distinct reproduction of the sound'waves which were translated into the sound wave groove of the record is heard in e, 1923. serial no. $11,003.

` metallic sounds, such as are caused by intimate contact of the needle with the record groove and my work up to the present time leads me to believe that friction'electricity is generated by the relative movement of the sound record groove and the needle,

which electricity is picked up from the nonconducting record and impressed. upon the grid --3-- thereby varying the current flowingfin the filament plate circuit in accord-v ance with the sound record groove.

Altho I have shown and described a specificv adaptation of my invention, I do not desire to limit myself to the details of the sameor to any specific apparatus, as I believe that I am the first to discover and pro* p ducel an apparatus of this character.

claim: Tl. An apparatus for reproducing sound comprising an electron discharge device in cluding a iilainent, a grid and a plate, a circuit connecting the filament land plate and including a source of potential and a translating device, and a needle adapted-to ride in a groove in a soundrecord electrically' connected to said capacity.

2. An apparatus for reproducing sound comprising an electron discharge device in? cluding a filament, a grid and .a plate, a circuit connecting the filament and plate and including a source ofpotential and a translatgrid Without interposed ing device, and a needle adapted to ride in` a groove 1n a sound record electrically conf nccted to said grid without interposed caff-'ri pacityA or potential.

` 3. The combination with a soundrecord'l y and a conducting needle for contact ther--- f from including an electron discharge Tdevice having a source of potential connected in circuit with the filament and plate of said device, and a conductor directly electrically with, of means for reproducing sound thereyconnecting the said needle to the grid of said device without interposed capacity.

In witness whereof I have hereunto set- Iny hand this 3rd day of January 1923.

' THEODORE wiLLARD OASE. 

